Heart of Tantic Sex by Diana Richardson is my top pick.
It's not strictly about karezza but outlines all the bonding behaviors emphasized on karezza. It's also short and concise.
> I'm looking for a book that gets into the topic very gently, appealing to a sense of bonding, closeness, and spiritual expansion over any sense of excitement and adventure.
The Heart of Tantric Sex by Diana Richardson has the feel you're looking for. Unfortunately, it's a mix of really excellent material and some misleading chunks. I wrote a review that tries to separate the two so you can focus on the many good parts:
I also wrote an online guide for couples that is very much aimed at "bonding, closeness, and spiritual expansion." This post is an overview:
The guide is basically a book in blog form. Here's an excerpt from one of the posts:
> Tantric sex is often pitched to sexual thrill seekers. In my experience, it is actually most suitable for established couples. It's equally appealing for couples who are having good sex and want to keep making it better, and couples who have slipped into the doldrums and are unhappy with the direction their sex lives are trending. If you and your partner have a strong, loving relationship, but you're wondering if the sex is going to be all downhill from here, with less passion every year, the good news is that it definitely doesn't have to be, and learning tantra is one of the best ways to amplify (or restore) the passion you had at the beginning and make it last.
Was it wrong for you to say those things in the past? Arguably yes. But, you're human. On top of that. in your early 20's with a brain that hasn't fully developed yet. Try and forgive yourself. And if you do break up with her, explain how you felt when you said those phrases.
Personally, when a girl is insecure and is need consistent validation. It dampens my desire, because it signals to me that she doesn't love herself. I'm sure that can make any man feel like he isn't spending his time and energy well if said person doesn't even think they deserve it.
If you do end the relationship. I would at least ask her about her past if you haven't already done so. And where she thinks this insecurity and feelings of worthlessness and self hatred come from.
You need for her to value and love herself, so that you can do the same through her.
If you do wish to continue with the relationship, I would want her promise to work on these deficiencies. But, recognize that yours need work as well. I doubt you would have ever ended up with her and still be there if you didn't.
How can the two of you work through these issues? I would recommend tantra/karezza ... https://www.amazon.com/Heart-Tantric-Sex-Unique-Fulfillment/dp/1903816378
With daily meditation and focusing intent towards greater harmony peace within, with others, and the world.
Good luck. May you decide the best way forward for yourself.